JP2007294059A - Perpendicular recording magnetic head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a head in which narrowing a track can be performed while holding high magnetic field intensity, size dependency by manufacturing variation of magnetic field intensity and distribution is small though the head is the perpendicular recording magnetic head in which data of adjacent tracks is not attenuated and erased. <P>SOLUTION: Magnetic objects (trailing/side shield) 32, 33 for making magnetic field slope steep are provided at both sides of a trailing side and a track width side of a pole tip 1B of a main magnetic pole 1. The head is constituted so that interval (side gap length g1) between the side shield 33 and a throat height part of the pole tip 1B is made small from a floating plane toward an element height direction. That is, the side gap length g1(2) at an element height position P2 is smaller than the side gap length g1 (1) in the floating plane position P1 (g1(1)>g1(2)). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a perpendicular recording magnetic head, and more particularly to a perpendicular recording magnetic head having a main magnetic pole and an auxiliary magnetic pole.

  The magnetic recording / reproducing apparatus includes a magnetic recording medium and a magnetic head, and data on the magnetic recording medium is read and written by the magnetic head. In order to increase the recording capacity per unit area of the magnetic recording medium, it is necessary to increase the surface recording density. However, in the current in-plane magnetic recording system, if the recorded bit length is small, there is a problem of thermal fluctuation of magnetization of the medium, and there is a problem that the surface recording density cannot be increased. As a recording system that can solve this problem, there is a perpendicular magnetic recording system that records a magnetization signal in a direction perpendicular to the medium. There are two types of perpendicular magnetic recording methods: a method using a double-layered perpendicular medium having a soft magnetic backing layer as a recording medium and a method using a single-layer perpendicular medium having no soft magnetic backing layer. When a double-layer perpendicular medium is used as the recording medium, a stronger recording magnetic field can be applied to the medium by performing recording using a so-called single-pole head having a main magnetic pole and an auxiliary magnetic pole. In order to generate a magnetic field, the main magnetic pole is configured such that the volume is reduced as it approaches the air bearing surface, and the width is generally constant at several hundred nm or less near the air bearing surface. The air bearing surface shape of the main pole is generally an inverted trapezoidal shape with a narrow width on the leading side in consideration of the case where the head has a skew angle.

  The magnetic field gradient in the head magnetic field vertical component profile that records the boundary of the recording bit cell together with the recording head magnetic field strength, that is, the magnetic field gradient in the head magnetic field vertical component profile in the head running direction is also an important factor for realizing a high recording density. is there. In the future, in order to achieve a higher recording density, the magnetic field gradient must be further increased. Patent Document 1 describes a structure in which a trailing side shield is disposed via a nonmagnetic layer on the trailing side and the track side side of the main magnetic pole in order to improve the recording magnetic field gradient.

JP 2005-190518 A

The recording magnetic field and distribution of the magnetic head must be optimized according to the recording medium. The magnetic field strength and distribution greatly depend on the throat height. The throat height is the pole width in the track width direction from the medium facing surface toward the element height direction in order to concentrate the magnetic flux at the tip of the pole tip of the main pole, which faces the medium and defines the track width. This is the length from the medium facing surface to the position (aperture position) where the rate of change changes. When the throat height is small, the magnetic field strength is large and the distribution width in the track width direction is also large. When the throat height is large, the magnetic field strength is small, and the magnetic field distribution width in the track width direction is also small. When the magnetic field strength is small, recording on a medium having a large coercive force is impossible. When the distribution width in the track width direction is large, there is a problem that data on adjacent tracks is erased.
Further, in order to realize a high density, it is indispensable to increase the linear recording density and the track density. For this purpose, it is necessary to reduce the recording track width, and a side shield structure head has been proposed. In this structure, the so-called side gap between the side shield and the main pole, and the film thickness of the side shield are important.

The dimensional tolerances of the throat height and side shield are very important, and suppressing manufacturing variation is a challenge for higher density. This variation results in performance degradation and yield reduction. The throat height, the thickness of the side shield, and the like have factors that cause variations in both the wafer process and the processing step for polishing the air bearing surface.
From the above, it is indispensable to reduce the magnetic field strength and the variation in distribution in order to improve the performance and manufacturing yield of the magnetic head. This problem is a problem that must be solved in order to achieve a higher recording density of a magnetic disk device using perpendicular magnetic recording.
An object of the present invention is to provide a perpendicular recording magnetic head having small dimensional dependence due to manufacturing variations in magnetic field strength and distribution.

  A perpendicular recording magnetic head according to the present invention includes a main magnetic pole and an auxiliary magnetic pole, and the main magnetic pole has a pole tip that defines a recording track width, and a yoke portion that recedes in the element height direction from the pole tip. Magnetic material (trailing / side shield) for steep magnetic field gradient on the trailing side and the track width direction side of the chip, and the distance between the main pole and side shield (side gap length) It has a structure that decreases in the vertical direction.

  The front end portion of the main pole has a width corresponding to the track width by a predetermined distance from the air bearing surface in the element height direction, and the side surface of the magnetic body facing both side surfaces of the front end portion is opposite to both side surfaces of the front end portion. Have an angle such that the distance between them decreases in the element height direction.

  It is desirable that an angle formed between a side surface of the magnetic body and a surface parallel to the track width direction is 104 degrees or more and 130 degrees or less.

  The front end of the main pole has a shape in which the width in the track width direction increases toward the element height direction, and the side surface of the magnetic body facing both side surfaces of the front end is a surface parallel to the track width direction. The configuration may be orthogonal to the above.

  The spread angle of the tip of the main magnetic pole in the track width direction is desirably 104 degrees or greater and 130 degrees or less with respect to a plane parallel to the track width direction.

  According to the present invention, the magnetic field strength, the distribution throat height, and the side shield thickness dependency can be reduced, so that the manufacturing yield can be improved while maintaining the performance of the magnetic head.

Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, the same functional parts will be described with the same reference numerals.
FIG. 14A is a top view showing a schematic configuration of a magnetic disk apparatus on which the perpendicular recording magnetic head of the present invention is mounted. FIG. 14B is a cross-sectional view thereof. The magnetic disk device records and reproduces a magnetization signal by a magnetic head mounted on a magnetic head slider 13 fixed to the tip of a suspension 12 at a predetermined position on a magnetic disk (magnetic recording medium) 11 rotated by a motor 28. . By rotating the rotary actuator 15, the position (track) of the magnetic head in the radial direction of the magnetic disk can be selected. A recording signal to the magnetic head and a read signal from the magnetic head are processed by a signal processing circuit or the like mounted on the head amplifier 35a and the printed board 35b.

FIG. 1 is a schematic diagram of the front end portion of the main pole of the perpendicular recording magnetic head according to the first embodiment viewed from the trailing direction. FIG. 2 is a schematic view of the vicinity of the main magnetic pole as seen from the air bearing surface. FIG. 1 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a schematic cross-sectional view at the track center of the perpendicular recording magnetic head according to the first embodiment. FIG. 3 also shows the magnetic recording medium 11.
As shown in FIG. 3, the perpendicular recording magnetic head 10 is a recording / reproducing composite head having a recording head (single pole head) 25 having a main magnetic pole 1 and an auxiliary magnetic pole 3 and a reproducing head 24 having a reproducing element 7. is there. A reproducing element 7 composed of a giant magnetoresistive element (GMR), a tunnel magnetoresistive element (TMR), etc. is between a pair of magnetic shields (reproducing shields) composed of a lower shield 8 on the leading side and an upper shield 9 on the trailing side. Is arranged. The main magnetic pole 1 and the auxiliary magnetic pole 3 are magnetically connected by a pillar 17 at a position away from the air bearing surface, and the thin film conductor coil 2 is linked to the magnetic circuit constituted by the main magnetic pole 1, the auxiliary magnetic pole 3 and the pillar 17. ing. The main magnetic pole 1 is disposed on the leading side of the auxiliary magnetic pole 3. The main magnetic pole 1 is composed of a main magnetic pole yoke portion 1A and a main magnetic pole tip portion (pole tip) 1B which is exposed on the head air bearing surface and defines the track width.
The magnetic flux emitted from the main magnetic pole 1 of the recording head 25 forms a magnetic flux path that returns to the auxiliary magnetic pole 3 through the magnetic recording layer 19 and the soft magnetic backing layer 20 of the magnetic recording medium 11, and records a magnetization pattern on the magnetic recording layer 19. To do. An intermediate layer may be formed between the magnetic recording layer 19 and the soft magnetic backing layer 20.

As shown in FIG. 1, the pole tip 1B has a track width Pw from the element height (throat height Th) position P2 to the air bearing surface position P1 and the portion where the width in the track width direction is narrowed toward the air bearing surface. And a corresponding constant width portion. FIG. 2 shows the shape of the pole tip 1B as seen from the air bearing surface. The pole tip 1B has an inverted trapezoidal shape in which the width in the track width direction is wider on the trailing side than on the leading side, and the track width Pw is defined by the width on the trailing side. The
As shown in FIGS. 1 and 2, the magnetic bodies 32 and 33 arranged on the trailing side and the track width direction of the pole tip 1B absorb the magnetic flux in the head running direction, and the magnetic field gradient of the head magnetic field vertical component profile is increased. A trailing shield 32 for increasing, and a side shield 33 for reducing magnetic field leakage in the track width direction in order to realize a narrow track.
In the head structure shown in FIG. 3, the auxiliary magnetic pole 3 is arranged on the leading side of the main magnetic pole 1, but the auxiliary magnetic pole 3 may be arranged on the leading side of the main magnetic pole 1 as shown in FIG. 4. Further, as shown in FIG. 5, a coil may be disposed between the upper shield 9 and the main magnetic pole 1, or a magnetic material may be disposed although not shown. Further, as shown in FIG. 6, the air bearing surface may have a side surface of the side shield 33 (a surface facing the side surface of the pole tip) inclined along the side surface of the inverted trapezoidal pole tip 1 </ b> B. Moreover, as shown in FIG. 7, the side shield 33 and the trailing shield 32 may be separated. Further, in order to obtain a larger magnetic field strength, a structure having only a side shield may be used.

  In the magnetic head 10 of the present embodiment, as shown in FIG. 1, the distance (side gap length gl) between the side shield 33 and the throat height portion of the pole tip 1B is from the air bearing surface toward the element height direction. It takes a structure that becomes smaller (in the direction away from the air bearing surface). That is, the side gap length gl (2) at the element height position P2 is smaller than the side gap length gl (1) at the air bearing surface position P1 (gl (1)> gl (2)).

  The recording magnetic field generated from the recording head 25 of the perpendicular recording magnetic head 10 according to the first embodiment and the main magnetic pole of the recording head having the conventional structure was calculated by three-dimensional magnetic field calculation. The recording head having the conventional structure used for the calculation has a constant distance (side gap length gl) between the main magnetic pole tip and the side shield. The calculation conditions are as follows. The side gap length gl of the recording head 25 according to the first embodiment shown in FIG. 1 is 100 nm at the air bearing surface position P1 and 25 nm at the element height position P2. At this time, the opening angle θ from the surface parallel to the air bearing surface of the side shield 33 is 127 degrees. The pole tip 1B has the shape shown in FIG. 2 and has a film thickness of 200 nm, a trailing side width of 100 nm, and a leading side width of 44 nm. The distance between the pole tip 1B and the trailing shield 32 (trailing gap Tg) was 40 nm.

  The material of the pole tip 1B is CoNiFe, the saturation magnetic flux density is 2.4T, and the relative permeability is 500. For the yoke portion 1A of the main magnetic pole 1, 80 at% Ni-20 at% Fe having a saturation magnetic flux density of 1.0 T was used. The auxiliary magnetic pole 3 is made of 80 at% Ni-20 at% Fe with a saturation magnetic flux density of 1.0 T. The size is 30 μm in the track width direction, 16 μm in the element height direction, and 2 μm in film thickness. It was. The upper shield 9 and the lower shield 8 are made of 80 at% Ni-20 at% Fe with a saturation magnetic flux density of 1.0 T. The size is 32 μm in the track width direction and 16 μm in the element height direction. The thickness was 1.5 μm. The material of the trailing / side shields 32 and 33 was 45 at% Ni-55 at% Fe, the saturation magnetic flux density was 1.7 T, and the relative magnetic permeability was 1000.

CoTaZr was used as the material of the soft magnetic backing layer 20 of the magnetic recording medium 11, the distance from the head floating surface to the surface of the soft magnetic backing layer 20 was 40 nm, and the film thickness of the soft magnetic backing layer 20 was 150 nm. The recording magnetic field was calculated at the center position of the magnetic recording layer 19 21 nm from the head flying surface. The recording current value was 35 mA, and the number of turns of the coil was 5 turns.
For a recording head having a conventional structure with a constant side gap length, the calculation was performed under the same conditions as the recording head of the above-described embodiment, except for the shape of the side shield.

  FIG. 8 shows the calculation results. FIG. 8 is a diagram in which the maximum value of the recording magnetic field strength of the recording head 25 according to the first embodiment and the recording head of the conventional structure is plotted on the vertical axis, and the throat height Th and the side shield thickness t are plotted on the horizontal axis. In this calculation, the throat height Th and the side shield thickness t are assumed to change with the same dimensions. It can be seen from FIG. 8 that the structure according to the first embodiment is less dependent on the throat height and the side shield thickness. When the throat height and the side shield thickness are changed from 100 nm to 50 nm, the recording head of the conventional structure changes by 5000 (× 1000 / 4π (A / m)), whereas the recording head of the first embodiment. It is as small as 4000 (× 1000 / 4π (A / m)). When the change in the magnetic field strength is expressed as a ratio of the maximum magnetic field strength when the throat height is 75 nm and the side shield thickness is 75 nm, it corresponds to 48% of the maximum magnetic field strength when the throat height Th is 75 nm in the case of the conventional structure. . On the other hand, in the case of the first embodiment, this value could be reduced to 36%. In a perpendicular recording magnetic head having a main magnetic pole and an auxiliary magnetic pole, the magnetic field strength increases as the throat height Th of the main magnetic pole decreases. Further, in the structure in which the side shield is provided, the smaller the side gap length, the greater the ability to absorb the magnetic flux of the side shield, and the magnetic field distribution in the track width direction becomes narrower. Moreover, since the variation in the magnetic field intensity can be suppressed, the variation in the magnetic field gradient can also be suppressed at the same time.

  FIG. 9 shows the magnetic field distribution width in the track width direction. In FIG. 9, the horizontal axis represents the throat height and the side shield thickness, and the vertical axis represents the magnetic field distribution when the coercive force of the medium is 5000 (× 1000 / 4π (A / m)). Width. While the difference in the magnetic field distribution width of the conventional structure is 190 nm, the structure of this example can be suppressed to 80 nm, which is half or less.

  As described above, when the recording head according to the first embodiment is used, variations in magnetic field strength can be suppressed, and variations such as overwrite characteristics can be suppressed. In addition, since variations in magnetic field gradient can be suppressed, variations in reproduction resolution characteristics and the like can be suppressed. Furthermore, since the variation in the magnetic field distribution width in the track width direction can be suppressed, the variation in the effective track width can be suppressed. As a result, the manufacturing yield can be improved while maintaining the performance of the magnetic head.

  FIG. 10 shows the result of the dependency of the maximum value of the recording magnetic field strength when the angle θ of the side shield 33 is changed in the first embodiment. FIG. 11 shows the result of the change in the magnetic field strength as a ratio at the maximum magnetic field strength when the throat height is 75 nm and the side shield thickness is 75 nm. As shown in FIG. 10, the variation in the magnetic field intensity decreases as the angle θ increases. As shown in FIG. 11, the rate of change in the maximum magnetic field intensity when the throat height and the side shield thickness are 75 nm also decreases. I understand. FIG. 12 shows the magnetic field distribution width in the track width direction of the first embodiment in which the angle θ of the side shield 33 is changed. It can be seen that the variation in the magnetic field distribution width can be suppressed as the angle θ increases. It is desirable that the angle θ is large. However, if it is too large, the effect of the side shield is lost, and the distribution in the width direction is deteriorated. In addition, it is difficult to manufacture a large angle, and it is not desirable to make the magnetic body an acute angle because it causes the concentration of magnetic flux. Therefore, it is desirable that the angle θ be 104 to 127 degrees, particularly about 130 degrees. Is desirable.

In the calculation of the first embodiment, the throat height and the side shield thickness are the same, but the thicknesses of the trailing shield 32 and the side shield 33 may be different. A study was conducted when the thickness t of the side shield 33 was 20 nm shorter than the throat height Th. The value indicated by the ratio of the maximum magnetic field strength when the change in the magnetic field strength is the throat height and the side shield thickness is 75 nm corresponds to 48% in the case of the conventional structure, whereas in the case of this structure, This value could be reduced to 40%.
The first embodiment is a composite type perpendicular recording magnetic head having a recording head and a reproducing head. However, the present invention is not limited to this configuration, and a perpendicular recording magnetic head having only a recording head may be used.

  FIG. 13 is a schematic plan view of an example of the structure of the main pole of the perpendicular recording magnetic head according to the second embodiment of the present invention viewed from the trailing side. The configuration other than the main magnetic pole is the same as that of the first embodiment shown in FIGS. Therefore, here, differences from the first embodiment will be described. The width (geometric track width Pw) of the pole tip 1B of the main pole 1 exposed on the air bearing surface is narrower than the width in the track width direction of the aperture position (element height) P2, and the side gap length gl is the air bearing surface. It decreases from the position P1 toward the element height P2. That is, gl (1)> gl (2). Even in such a structure, when the throat height and the side shield thickness are small, the side gap length gl is small and the spread of the magnetic field in the track width direction is suppressed. Further, when the throat height and the side shield thickness are large, the side gap length gl is larger than the former, and therefore the effect of suppressing the spread of the magnetic field in the track width direction becomes small. Therefore, the dependency on the throat height and the side shield thickness can be reduced, and the manufacturing yield can be improved while maintaining the performance of the magnetic head.

FIG. 3 is a schematic top view of the pole tip of the perpendicular recording magnetic head according to the first embodiment when viewed from the trailing direction. FIG. 3 is a schematic view of the vicinity of a pole chip of a perpendicular recording magnetic head according to a first embodiment when viewed from the air bearing surface. FIG. 3 is a schematic cross-sectional view at the track center of the perpendicular recording magnetic head according to the first embodiment. FIG. 3 is a schematic cross-sectional view at the track center of the perpendicular recording magnetic head according to the first embodiment. FIG. 3 is a schematic cross-sectional view at the track center of the perpendicular recording magnetic head according to the first embodiment. FIG. 3 is a schematic view of the vicinity of a pole chip of a perpendicular recording magnetic head according to a first embodiment when viewed from the air bearing surface. FIG. 3 is a schematic view of the vicinity of a pole chip of a perpendicular recording magnetic head according to a first embodiment when viewed from the air bearing surface. FIG. 6 is a diagram showing a comparison of the dependence of the recording magnetic field strength on the strut height and side shield thickness between the recording head of the first embodiment and the recording head of the conventional structure. FIG. 6 is a diagram showing a comparison of the dependence of the magnetic field distribution width on the strut height and side shield thickness between the recording head of the first embodiment and the recording head of the conventional structure. FIG. 6 is a diagram showing the dependence of the recording magnetic field strength of the recording head on the strut height and side shield thickness when the angle of the side shield is changed. It is a figure which shows the result which showed the change in the magnetic field strength by the ratio in the maximum magnetic field strength when the throat height and the side shield thickness are 75 nm. It is a figure which shows the magnetic field distribution width of a track width direction when the angle of a side shield is changed. FIG. 6 is a schematic top view of a pole tip of a perpendicular recording magnetic head according to a second embodiment viewed from the trailing direction. 1 is an upper flat schematic diagram showing a schematic configuration of a magnetic disk device on which a perpendicular recording magnetic head of the present invention is mounted. FIG. 14B is a schematic cross-sectional view of the magnetic disk device shown in FIG. 14A.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Main magnetic pole, 1A ... Main magnetic pole yoke part, 1B ... Pole chip, 2 ... Thin film conductor coil, 3 ... Auxiliary magnetic pole, 7 ... Reproducing element, 8 ... Lower shield, 9 ... Upper shield, 10 ... Perpendicular recording magnetic head, DESCRIPTION OF SYMBOLS 11 ... Magnetic disk, 12 ... Suspension, 13 ... Magnetic head slider, 15 ... Rotary actuator, 17 ... Pillar, 19 ... Magnetic recording layer, 20 ... Soft magnetic backing layer, 24 ... Reproduction head, 25 ... Recording head, 32, 33 ... Magnetic material (trailing / side shield).

Claims (20)

  A main magnetic pole having a tip defining the track width, an auxiliary magnetic pole, a coil interlinking with the magnetic circuit composed of the main magnetic pole and the auxiliary magnetic pole, and on the trailing side of the main magnetic pole and on both sides in the track width direction A perpendicular recording magnetic head comprising: a magnetic body provided; and a distance between both side surfaces of the front end portion of the main magnetic pole and the magnetic body is reduced in the element height direction.   The front end portion of the main pole has a width corresponding to the track width by a predetermined distance from the air bearing surface in the element height direction, and the side surfaces of the magnetic body facing both side surfaces of the front end portion are on both sides of the front end portion. 2. The perpendicular recording magnetic head according to claim 1, wherein the perpendicular recording magnetic head has an angle such that a distance from the surface becomes smaller in the element height direction.   3. The perpendicular recording magnetic head according to claim 2, wherein an angle formed between a side surface of the magnetic body and a surface parallel to the track width direction is not less than 104 degrees and not more than 130 degrees.   The front end portion of the main pole has a shape in which the width in the track width direction increases toward the element height direction, and the side surface of the magnetic body facing both side surfaces of the front end portion is a plane parallel to the track width direction. 2. The perpendicular recording magnetic head according to claim 1, wherein the perpendicular recording magnetic head is perpendicular to the first recording medium.   5. The perpendicular recording magnetic head according to claim 4, wherein a spread angle of the front end portion of the main magnetic pole in the track width direction is not less than 104 degrees and not more than 130 degrees with respect to a plane parallel to the track width direction.   2. The perpendicular recording magnetic head according to claim 1, wherein a nonmagnetic material is filled between a tip portion of the main magnetic pole and the magnetic material.   2. The perpendicular recording magnetic head according to claim 1, wherein the magnetic body has an integral structure and has a space between the main magnetic pole and the trailing side.   The main magnetic pole has an inverted trapezoidal shape in which the width in the track width direction is wider on the trailing side than on the leading side, and the side surface of the magnetic body facing both side surfaces of the main magnetic pole follows the both side surfaces of the main magnetic pole. 2. The perpendicular recording magnetic head according to claim 1, wherein the perpendicular recording magnetic head is inclined.   2. The perpendicular recording magnetic head according to claim 1, wherein the magnetic body is divided into a part located on both sides of the main magnetic pole in the track width direction and a part located on the trailing side.   2. The perpendicular recording magnetism according to claim 1, wherein the main magnetic pole has a yoke portion magnetically connected to the tip portion, and is magnetically connected to the auxiliary magnetic pole through the yoke portion. head.   2. The perpendicular recording magnetic head according to claim 1, further comprising a reproducing head provided adjacent to the main magnetic pole or the auxiliary magnetic pole.   A main magnetic pole having a tip defining the track width, an auxiliary magnetic pole, a coil interlinking with the magnetic circuit composed of the main magnetic pole and the auxiliary magnetic pole, and on the trailing side of the main magnetic pole and on both sides in the track width direction A perpendicular recording magnetic head comprising: a magnetic body provided; and a distance between both side surfaces of the front end portion of the main magnetic pole and the magnetic body decreases as the distance from the air bearing surface increases.   The front end portion of the main pole has a width corresponding to the track width by a predetermined distance in a direction away from the air bearing surface, and the side surfaces of the magnetic body facing both side surfaces of the front end portion are both side surfaces of the front end portion. 13. The perpendicular recording magnetic head according to claim 12, wherein the angle of the magnetic recording medium has an angle that decreases with increasing distance from the air bearing surface.   14. The perpendicular recording magnetic head according to claim 13, wherein an angle formed between a side surface of the magnetic body and a surface parallel to the track width direction is not less than 104 degrees and not more than 130 degrees.   The front end portion of the main pole has a shape in which the width in the track width direction increases in a direction away from the air bearing surface, and the side surfaces of the magnetic body facing both side surfaces of the front end portion are parallel to the track width direction. The perpendicular recording magnetic head according to claim 12, wherein the perpendicular recording magnetic head is perpendicular to the head.   16. The perpendicular recording magnetic head according to claim 15, wherein a spread angle of the tip portion of the main magnetic pole in the track width direction is not less than 104 degrees and not more than 130 degrees with respect to a plane parallel to the track width direction.   13. The perpendicular recording magnetic head according to claim 12, wherein the magnetic body has an integral structure and is spaced from the trailing side of the main magnetic pole.   The main magnetic pole has an inverted trapezoidal shape in which the width in the track width direction is wider on the trailing side than on the leading side, and the side surface of the magnetic body facing both side surfaces of the main magnetic pole follows the both side surfaces of the main magnetic pole. 2. The perpendicular recording magnetic head according to claim 1, wherein the perpendicular recording magnetic head is inclined.   2. The perpendicular recording magnetic head according to claim 1, wherein the magnetic body is divided into a part located on both sides of the main magnetic pole in the track width direction and a part located on the trailing side. 13. The perpendicular recording magnetic head according to claim 12, further comprising a reproducing head provided adjacent to the main magnetic pole or the auxiliary magnetic pole.

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